Marialis Cultus (English: Marian Devotion) is the title of a Mariological apostolic exhortation by Pope Paul VI issued on February 2, 1974.
The exhortation sought to integrate devotion to Mary into the pastoral catechetical process, especially in liturgical catechesis, in a manner harmonious with the reforms of Vatican II.
[T]he history of piety shows how 'the various forms of devotion towards the Mother of God that the Church has approved within the limits of wholesome and orthodox doctrine' have developed in harmonious subordination to the worship of Christ.
The Second Vatican Council has already authoritatively denounced both the exaggeration of content and form which even falsifies doctrine and likewise the small-mindedness which obscures the figure and mission of Mary... Another deviation is sterile and ephemeral sentimentality, so alien to the spirit of the Gospel that demands persevering and practical action.
[5] The exhortation noted that every element of the church's prayer life, including Marian devotions, should draw its inspiration from the Bible and harmonize with the liturgy.